Adding a testing data point. I've run PA 0.99.4 (on Debian, not Ubuntu)
on an Acer Aspire One 722, which has a dual-core (but I disabled 1 core
for testing) AMD C-50 processor running at 1 GHz
(http://en.wikipedia.org/wiki/AMD_mobile_platform#Brazos_.28Fusion.29_platform_.282011.29).
The HDA codec on this is a Conexant CX20588.

The audio is smooth in Rhythmbox and Totem (except if I play something
reasonably stressful like 720p or 1080p video). It's using gst-plugins-
good 0.10.30, and with 720p/1080p video, I do see the rewind madness and
messed up sound. It continues to happen when I switch to a less
stressful video, and fixes itself if I pause for long enough for the
sink to suspend.

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https://bugs.launchpad.net/bugs/825709

Title:
  Choppy sound due to excessive rewinding on low-end (Atom) CPUs

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